All of lore.kernel.org
 help / color / mirror / Atom feed
* [U-Boot] [PATCH 1/4] mtd: Add a function to report when the MTD dev list has been updated
@ 2018-11-16 14:40 Boris Brezillon
  2018-11-16 14:40 ` [U-Boot] [PATCH 2/4] mtd: Parse mtdparts/mtdids again when the MTD " Boris Brezillon
                   ` (2 more replies)
  0 siblings, 3 replies; 9+ messages in thread
From: Boris Brezillon @ 2018-11-16 14:40 UTC (permalink / raw)
  To: u-boot

We need to parse mtdparts/mtids again everytime a device has been
added/removed from the MTD list, but there's currently no way to know
when such an update has been done.

Add an ->updated field to the idr struct that we set to true every time
a device is added/removed and expose a function returning the value
of this field and resetting it to false.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
---
 drivers/mtd/mtdcore.c   | 16 +++++++++++++++-
 include/linux/mtd/mtd.h |  1 +
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index fb6c779abbfe..7a15ded8c883 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -87,14 +87,17 @@ struct idr_layer {
 
 struct idr {
 	struct idr_layer id[MAX_IDR_ID];
+	bool updated;
 };
 
 #define DEFINE_IDR(name)	struct idr name;
 
 void idr_remove(struct idr *idp, int id)
 {
-	if (idp->id[id].used)
+	if (idp->id[id].used) {
 		idp->id[id].used = 0;
+		idp->updated = true;
+	}
 
 	return;
 }
@@ -134,6 +137,7 @@ int idr_alloc(struct idr *idp, void *ptr, int start, int end, gfp_t gfp_mask)
 		if (idl->used == 0) {
 			idl->used = 1;
 			idl->ptr = ptr;
+			idp->updated = true;
 			return i;
 		}
 		i++;
@@ -155,6 +159,16 @@ struct mtd_info *__mtd_next_device(int i)
 }
 EXPORT_SYMBOL_GPL(__mtd_next_device);
 
+bool mtd_dev_list_updated(void)
+{
+	if (mtd_idr.updated) {
+		mtd_idr.updated = false;
+		return true;
+	}
+
+	return false;
+}
+
 #ifndef __UBOOT__
 static LIST_HEAD(mtd_notifiers);
 
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 68e591532492..d20ebd820289 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -581,6 +581,7 @@ int mtd_arg_off_size(int argc, char *const argv[], int *idx, loff_t *off,
 void mtd_get_len_incl_bad(struct mtd_info *mtd, uint64_t offset,
 			  const uint64_t length, uint64_t *len_incl_bad,
 			  int *truncated);
+bool mtd_dev_list_updated(void);
 
 /* drivers/mtd/mtd_uboot.c */
 int mtd_search_alternate_name(const char *mtdname, char *altname,
-- 
2.17.1

^ permalink raw reply related	[flat|nested] 9+ messages in thread
end of thread, other threads:[~2018-11-19 12:10 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2018-11-16 14:40 [U-Boot] [PATCH 1/4] mtd: Add a function to report when the MTD dev list has been updated Boris Brezillon
2018-11-16 14:40 ` [U-Boot] [PATCH 2/4] mtd: Parse mtdparts/mtdids again when the MTD " Boris Brezillon
2018-11-16 14:40 ` [U-Boot] [PATCH 3/4] mtd: Delete partitions attached to the device when a device is deleted Boris Brezillon
2018-11-17  9:19   ` Boris Brezillon
2018-11-19  6:16     ` Heiko Schocher
2018-11-19  9:25       ` Miquel Raynal
2018-11-19 11:57       ` Boris Brezillon
2018-11-19 12:10         ` Heiko Schocher
2018-11-16 14:40 ` [U-Boot] [PATCH 4/4] mtd: sf: Make sure we don't register the same device twice Boris Brezillon

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.